Head-mounted binocular night vision goggles with adjustable optical axis parallelism

Abstract

The utility model discloses head-mounted binocular night vision goggles with adjustable optical axis parallelism. The head-mounted binocular night vision goggles comprise a first eyepiece lens, a second eyepiece lens, an eyepiece frame, an eyepiece space ring, an eyepiece pressing ring, an eyepiece O-shaped sealing ring, an eyepiece seat, a dial, a diopter hand wheel, a hoop and the like which are respectively arranged according to a left binocular and a right binocular. The left eyepiece frame and the right eyepiece frame of the night vision goggles adopt eccentric structures, the eyepiece seats and the eyepiece frames are assembled and adjusted in a matched mode, optical axis parallelism testing and adjustment can be carried out at the same time, repeated disassembly and assembly are not needed, the structure is compact and light, and the problems that an existing head-mounted night vision goggles double-optical-path optical axis parallelism adjustment structure is inconvenient to operate, heavy, repeated in adjustment and the like are solved. The night vision goggles have the advantages of being efficient and rapid in adjustment, simple in operation and light in weight.

Description

Technical Field

[0001] The utility model relates to the technical field of head-mounted night vision goggles, in particular to a head-mounted binocular night vision goggles with adjustable optical axis parallelism. Background Art

[0002] Night vision goggles serve as the "eyes" of observers in dark environments, assisting them with tasks such as observation, identification, and search. The quality of their imaging directly impacts the quality of their understanding of the environment. Low-light-level binocular electro-optical devices are widely used in areas such as night hunting and outdoor sports. When the binocular eye axis misalignment exceeds a certain range, long-term use can cause dizziness, nausea, and other symptoms. Therefore, binocular eye axis parallelism has become a crucial factor affecting user comfort.

[0003] Adjusting the parallelism of the dual optical paths in head-mounted binocular night vision goggles improves the stereoscopic perception of observed targets to a certain extent, enabling more accurate judgment of target height and distance, avoiding misjudgments such as mistaking distant objects for near or near objects for far. This also improves viewing comfort and reduces eye fatigue. Relevant standards stipulate that the horizontal divergence, convergence, and vertical divergence of the optical axis parallelism of binocular instruments must be controlled within certain standard ranges.

[0004] like Figure 1 As shown, the prior art often adopts a collimator test method for binocular night vision goggles optical systems, that is, a collimator (with a cross scale) and a double-tube front mirror are used for testing and adjustment. The night vision goggles objective lens is directed toward the collimator, and the image of the collimator scale plate is located at the center of the night vision goggles field of view. The double-tube front mirror is directed toward one eyepiece of the night vision goggles, and the focal plane and diopter of the night vision goggles objective lens are adjusted to clearly see the image in the field of view. The front mirror is adjusted, and one of the observation systems is used as a test reference so that the cross scale of the double-tube front mirror coincides with the cross scale image of the collimator. Then, the position of the scale line of the double-tube front mirror of the other observation system relative to the scale image of the collimator is observed, and the deviation angle value of its optical axis is measured to ensure that the divergence, convergence and vertical directions of the optical axes of the two observation systems meet the requirements. If the point where the crosshairs of the left observation system's dual-tube front mirror overlap with the collimator's crosshairs is test datum 110, then the other observation system's dual-tube front mirror's crosshairs have four deviation points relative to the collimator's crosshairs: first test point 111, second test point 112, third test point 113, and fourth test point 114. First and third test points 111 and 113 represent vertical deviations of the lower and upper optical axes, respectively; second test point 112 represents horizontal convergence; and fourth test point 114 represents horizontal divergence.

[0005] At present, the parallelism of the optical axes of the dual light paths of head-mounted binocular night vision goggles can be adjusted by adjusting a certain link of the objective lens, image intensifier or eyepiece. Commonly used methods include objective lens adjustment method, low-light image intensifier adjustment method and eyepiece adjustment method.

[0006] like Figure 2 As shown, the left and right optical systems of binocular night vision goggles are divided into a first optical system 120 and a second optical system 121. Objective lens calibration typically involves calibrating the first optical system 120 first, then using the first optical system 120 as a reference for calibrating the second optical system 121. After calibrating the first optical system 120, the low-light level image intensifier 122 is installed into the goggle body 123. After adjusting the low-light level image intensifier 122 relative to the goggle body 123, the goggle is then installed into the objective lens mount 124. An adjustment gap 127 is provided between the objective lens mount 124 and the goggle body 123. A pressure ring 126 is designed with a wrench slot 125. A dedicated tool is used to secure the pressure ring 126 to the goggle body 123, securing the low-light level image intensifier 122 and the objective lens mount 124. The objective lens 1 can then be screwed into the objective lens mount 124. The same method can be used to complete the installation and calibration of the second optical system 121. After completing the installation and adjustment of the left and right optical systems of the binocular night vision goggles, the parallelism of the optical axes of the left and right optical systems can be tested using the parallel light tube test method. If the optical axis deviation value of the left and right optical systems is greater than the requirement, it is necessary to loosen the pressure ring 126 and readjust the position of the objective lens holder 124 until the optical axis parallelism meets the requirement.

[0007] Since the above objective lens adjustment method leaves an adjustment gap 127, the airtightness of the position of the objective lens pressure ring 126 is required to be high, and there is a risk of leakage if it is not controlled properly. In addition, since the objective lens needs to be fixed before testing, if the parallelism of the optical axis does not meet the requirements, the pressure ring 126 needs to be removed and readjusted, and the adjustment operation is time-consuming and labor-intensive.

[0008] like Figure 3 As shown in the figure, the low-light-level image intensifier calibration method for binocular night vision goggles involves using a dedicated tool to adjust the position of the low-light-level image intensifier 122. The image intensifier pressure ring 131 secures the low-light-level image intensifier 122 to the front lens body 130, and the objective lens assembly 132 is screwed onto the front lens body 130. Because the low-light-level image intensifier 122 adjustment process can easily pull on the cable, the operation is difficult and involves repeated disassembly and assembly, making it inconvenient.

[0009] like Figure 4 As shown, the binocular night vision goggles eyepiece adjustment method uses dial holes to adjust the eyepiece lenses to achieve optical axis parallelism adjustment. The first eyepiece frame 140 and the second eyepiece frame 141 are located within the eyepiece barrel 142 and can rotate about the axis. The first eyepiece lens 143 is firmly bonded to the first eyepiece frame 140, and the second eyepiece lens 144 is firmly bonded to the second eyepiece frame 141. An eyepiece spacer is provided between the two eyepiece frames. The outer walls of the first eyepiece frame 140 and the second eyepiece frame 141 are provided with a plurality of dial holes. The barrel is provided with waist-shaped grooves corresponding to the dial holes, which are used to dial the dial holes to cause the frames to drive the lenses to rotate about the axis to achieve optical axis parallelism adjustment.

[0010] Although the above eyepiece adjustment method is convenient to adjust, the addition of the lens frame increases the total weight of the eyepiece, which is not conducive to lightweight design. In addition, the eyepiece needs to be adjusted repeatedly, which is not convenient to operate. Utility Model Content

[0011] The technical problem to be solved by the present utility model is to overcome the above-mentioned shortcomings and provide a head-mounted binocular night vision goggles with adjustable optical axis parallelism, wherein the eyepiece frame 3 adopts an eccentric structure, the eyepiece seat 7 and the eyepiece frame 3 are coordinated and adjusted, and the optical axis parallelism test and adjustment can be carried out simultaneously.

[0012] Specifically, the technical solution of the present utility model is:

[0013] The invention discloses a head-mounted binocular night vision goggle with adjustable optical axis parallelism, which comprises an eyepiece first lens 1, an eyepiece second lens 2, an eyepiece frame 3, an eyepiece spacer 4, an eyepiece pressure ring 5, an eyepiece O-ring 6, an eyepiece seat 7, a graduated dial 8, a diopter hand wheel 9, a clamp 10 and the like.

[0014] The eyepiece frame 3 is equipped with the first eyepiece lens 1, the eyepiece spacer 4 and the second eyepiece lens 2. The eyepiece spacer 4 ensures that the optical spacing between the first eyepiece lens 1 and the second eyepiece lens 2 meets the requirements.

[0015] Furthermore, the eyepiece pressing ring 5 is threadedly connected to the eyepiece frame 3 to ensure that the positions of the eyepiece first lens 1 and the eyepiece second lens 2 are fixed.

[0016] Furthermore, the eyepiece O-ring 6 is fixed on the eyepiece frame 3 to ensure the sealing of the eyepiece frame 3 during the movement process.

[0017] Furthermore, the eyepiece frame 3 passes through the eyepiece seat 7, and the diopter handwheel 9 is threadedly connected to the eyepiece frame 3. By rotating the diopter handwheel 9, the eyepiece frame 3 moves axially smoothly in the eyepiece seat 7. A plurality of anti-slip knurlings are evenly spaced on the outer circumference of the diopter handwheel 9.

[0018] Furthermore, the inner circle and the outer circle of the eyepiece frame 3 are non-coaxial eccentric structures. When the diopter hand wheel 9 rotates and moves the eyepiece frame 3, the first eyepiece lens 1 and the second eyepiece lens 2 in the eyepiece frame 3 move synchronously off-axis, and the parallelism of the optical axis can be adjusted.

[0019] Furthermore, the clamp 10 is clamped on the eyepiece frame 3 to limit the position of the diopter hand wheel 9.

[0020] Furthermore, a scale plate 8 is fixed on the eyepiece holder 7 , and a mark of a diopter value is engraved on the scale plate 8 , which can be used to read the diopter value.

[0021] Beneficial effects of the utility model:

[0022] The technical problem to be solved by the present utility model is to overcome the above-mentioned shortcomings by designing a head-mounted binocular night vision goggle with adjustable optical axis parallelism. The left and right eyepiece frames of the night vision goggle adopt an eccentric structure. The eyepiece mount and the eyepiece frame are assembled and adjusted in a coordinated manner, allowing optical axis parallelism testing and adjustment to be performed simultaneously without repeated disassembly and assembly. The compact and lightweight structure solves the problems of the current dual-optical path optical axis parallelism adjustment structure of head-mounted night vision goggles, such as inconvenient operation, heavy weight, and repeated adjustment. The night vision goggles have the advantages of efficient and fast adjustment, simple operation, and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic diagram of the optical axis parallelism test principle of the prior art.

[0024] Figure 2 : Schematic diagram of objective lens adjustment for optical axis parallelism in the prior art.

[0025] Figure 3 : Schematic diagram of the optical axis parallelism low-light image intensifier adjustment in the prior art.

[0026] Figure 4 : Schematic diagram of an optical axis parallelism eyepiece adjustment in the prior art.

[0027] Figure 5 : A schematic diagram of the composition of the present utility model.

[0028] Figure 6 : Schematic diagram of the optical spacing adjustment of the first lens of the eyepiece and the second lens of the eyepiece of the present invention.

[0029] Figure 7 : Schematic diagram of the eyepiece frame, eyepiece seat and diopter hand wheel adjustment of the utility model.

[0030] Figure 8 : Schematic diagram of the non-coaxial eccentric structure of the inner circle and outer circle of the eyepiece frame of the present invention. DETAILED DESCRIPTION

[0031] Example

[0032] like Figure 5 As shown, a head-mounted binocular night vision goggles with adjustable optical axis parallelism consists of an eyepiece first lens 1, an eyepiece second lens 2, an eyepiece frame 3, an eyepiece spacer 4, an eyepiece pressure ring 5, an eyepiece O-ring 6, an eyepiece seat 7, a scale plate 8, a diopter handwheel 9, a clamp 10, etc.

[0033] like Figure 6 As shown, there is a step on the left side of the eyepiece frame 3, which can be used to install the first eyepiece lens 1. The outer circle of the eyepiece spacer 4 matches the inner circle of the eyepiece frame 3. The eyepiece spacer 4 is installed between the first eyepiece lens 1 and the second eyepiece lens 2. The eyepiece spacer 4 can be appropriately trimmed to ensure that the optical interval a between the first eyepiece lens 1 and the second eyepiece lens 2 meets the requirements.

[0034] like Figure 6 As shown, the outer circle of the eyepiece pressing ring 5 has a thread, and the eyepiece frame 3 has an inner circle thread. The outer circle thread of the eyepiece pressing ring 5 is connected with the inner circle thread of the eyepiece frame 3 to ensure that the positions of the first lens 1 and the second lens 2 of the eyepiece are fixed.

[0035] like Figure 6 As shown, the eyepiece O-ring 6 is made of rubber. The eyepiece O-ring 6 can be fixed in the groove on the left side of the eyepiece frame 3 by a special tool to ensure the sealing of the eyepiece frame 3 during movement.

[0036] like Figure 7 As shown, the outer circumference of the eyepiece frame 3 has three evenly distributed convex grooves, and the inner circumference of the eyepiece seat 7 has three evenly distributed grooves corresponding to the eyepiece frame 3. The eyepiece frame 3 passes through the eyepiece seat 7. The three evenly distributed grooves of the eyepiece seat 7 have stoppers to prevent the eyepiece frame 3 from completely passing axially through the eyepiece seat 7. The inner circumference of the diopter handwheel 9 has an internal thread, and the outer circumferential convex groove of the eyepiece frame 3 has an external thread. The inner thread of the diopter handwheel 9 is threadedly connected to the outer circumferential convex groove of the eyepiece frame 3. Rotating the diopter handwheel 9 drives the eyepiece frame 3 to move smoothly axially within the eyepiece seat 7. The outer circumference of the diopter handwheel 9 is evenly spaced with a number of anti-slip knurling patterns.

[0037] like Figure 7 As shown, there is a groove on the right side of the eyepiece frame 3, and the clamp 10 is clamped on the groove of the eyepiece frame 3 to limit the position of the diopter hand wheel 9.

[0038] like Figure 7 As shown, the scale plate 8 is fixed on the eyepiece seat 7, and the scale plate 8 is engraved with a diopter value mark, which can be used to read the diopter value.

[0039] like Figure 8 As shown, the inner circle and the outer circle of the eyepiece frame 3 are non-coaxial eccentric structures, and the distance between the center line of the outer circle and the center line of the inner circle is b = 0.1-0.3mm. When the diopter handwheel 9 rotates to move the eyepiece frame 3, the first eyepiece lens 1 and the second eyepiece lens 2 in the eyepiece frame 3 are synchronously moved axially off-axis. At the same time, the optical axis position can be appropriately adjusted by rotating the eyepiece seat 7, and the adjustment range is φc = 0.1-0.3mm. The optical axis parallelism requirement is guaranteed by adjusting the optical axes of the left and right branches of the night vision goggles.

Claims

1. A head-mounted binocular night vision goggles with adjustable optical axis parallelism, comprising a first eyepiece lens (1) and a second eyepiece lens (2) respectively arranged for left and right binoculars, characterized in that: The eyepiece frame (3), an eyepiece spacer (4), an eyepiece pressure ring (5), an eyepiece O-type sealing ring (6), an eyepiece seat (7) and a diopter hand wheel (9) are respectively arranged on the left and right sides; the eyepiece first lens (1), the eyepiece spacer (4) and the eyepiece second lens (2) are sequentially installed in the eyepiece frame (3); the eyepiece pressure ring (5) is connected to the eyepiece frame (3) by a thread; the eyepiece O-type sealing ring (6) is fixed on the eyepiece frame (3); the eyepiece frame (3) passes through the eyepiece seat (7); the diopter hand wheel (9) is connected to the eyepiece frame (3) by a thread; by rotating the diopter hand wheel (9), the eyepiece frame (3) can move axially smoothly in the eyepiece seat (7); The inner circle and outer circle of the eyepiece frame (3) are non-coaxial and eccentric structures. When the diopter hand wheel (9) rotates to move the eyepiece frame (3), the first eyepiece lens (1) and the second eyepiece lens (2) in the eyepiece frame (3) move synchronously in an off-axis axial direction, so as to adjust the optical axis position.

2. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to claim 1, characterized in that: Three convex grooves are evenly distributed on the outer circle of the eyepiece frame (3) and the inner circle of the eyepiece seat (7), and the groove of the eyepiece seat (7) has a stop for preventing the eyepiece frame (3) from completely passing through the eyepiece seat (7) axially.

3. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to claim 1, characterized in that: The distance b between the outer circle center line and the inner circle center line of the eyepiece frame (3) is 0.1-0.3 mm.

4. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to claim 3, characterized in that: The optical axis position is properly adjusted by rotating the eyepiece seat (7), and the adjustment range φc is 0.1-0.3 mm.

5. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to any one of claims 1 to 4, characterized in that: The device also comprises a scale plate (8) which is fixed on the eyepiece seat (7) and on which a mark of a diopter value is engraved for reading the diopter value.

6. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to any one of claims 1 to 4, characterized in that: It also includes a clamp (10), which is clamped on the eyepiece frame (3) and is used to limit the position of the diopter hand wheel (9).

7. The head-mounted binocular night vision goggles with adjustable optical axis parallelism according to any one of claims 1 to 4, characterized in that: The outer circumference of the sight hand wheel (9) is evenly spaced with a plurality of anti-skid knurling patterns.

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